tuning

Working on performance in one of java projects I found that the slowest part is copy method from file utility class. Method was implemented without buffering. Implementation was next: just using ‘while’ operator reading input stream and writing to output stream.

There are good article about i/o performance on sun website.

Listing 4-4 from article looks good, but provided method not perfect too. I have next reason: my application is a multithreaded application. And anytime I synchronize on a static field, I make a bottleneck, because all threads must block while waiting to enter the synchronized block of code.